When I boot the laptop, everything seems to run. I get the Windows XP prompt on the screen, then screen goes black as normal before Windows loads. I can hear the start sounds when it usually comes up but a black screen. I've check the video screen bios, it passes. I've run diagnostics, it seems to pass.
Two things you should try to resolve this issue: -
Check that the FN button on the keyboard to switch from the Laptop monitor to external monitor has not been enabled - these are usually 3 state switches (Laptop screen ON, External screen ON, Both ON) it is really easy to accidentally hit this without realizing.
If this works there is no need to try the second option.
Try booting to safe mode - as the laptop boots up and you see the Bios summary screen depress the F8 button and you should receive a screen containing several options.
Select the option to Boot to safe mode.
If the laptop boots up ok then login to XP, don't be alarmed at the change in screen resolution.
Right-click My Computer on the desktop and select Properties - Hardware - Device manager
In the tree-view containing the different hardware select Display Adapters you should see your graphics card in there
Right-click and select Scan for Hardware Changes if it is ok the close and reboot as normal
If there is a problem here it implies the driver is somehow corrupted and may need re-installing from the disk that came with the laptop.
When you first turn on the laptop, hit F8. Choose VGA mode. When it boots up, you should be able to see the screen. Right click on the desktop, choose settings, change the resolution to something you think it should be and then reboot. It should load up. My guess is that the resolution is too high. One other option, is that you may have the picture set to a secondary display. Choose Fn and whatever F key your keyboard uses to switch screens between the keyboard an monitor.If this is the cause, you should be able to hit the right key combination and get the picture back.
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If the Dell Diagnostics passes then the issue is in the software part of the computer.. You may have to reinstall the OS inorder to address this issue..
Dell has a default partition on the computer and you can install with the same.. If you have windows vista on the computer then tap F8 when the computer turns on and then you will be able to see the advanced boot options.. Select repair my computer.. In the repair my computer screen select the dell factory image restore... Your computer will go through the installation and it will be up and running... If you have windows Xp then you have to turn on the computer and when the dell logo appears you have to simultaneously press control and the F11key.. You will be able to reinstall the OS in this way.. If this option is not available then reinstall using the discThe issue will be fixed
Well it is most likely a issue with the Video driver as you are able to boot to the safe mode.I would suggest going back to the safe mode and deleting the present driver for the video from the device manager.before you restart the system just download the latest version from the support.dell.com so that you can reinstall it.Also check in the graphic properties which screen is set to be the defuat.Incase still not working i would suggest reinstalling the operating system before replacing any hardware.